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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build unix || windows
package net
import (
"internal/bytealg"
"runtime"
"syscall"
)
// Boolean to int.
func boolint(b bool) int {
if b {
return 1
}
return 0
}
func interfaceToIPv4Addr(ifi *Interface) (IP, error) {
if ifi == nil {
return IPv4zero, nil
}
ifat, err := ifi.Addrs()
if err != nil {
return nil, err
}
for _, ifa := range ifat {
switch v := ifa.(type) {
case *IPAddr:
if v.IP.To4() != nil {
return v.IP, nil
}
case *IPNet:
if v.IP.To4() != nil {
return v.IP, nil
}
}
}
return nil, errNoSuchInterface
}
func setIPv4MreqToInterface(mreq *syscall.IPMreq, ifi *Interface) error {
if ifi == nil {
return nil
}
ifat, err := ifi.Addrs()
if err != nil {
return err
}
for _, ifa := range ifat {
switch v := ifa.(type) {
case *IPAddr:
if a := v.IP.To4(); a != nil {
copy(mreq.Interface[:], a)
goto done
}
case *IPNet:
if a := v.IP.To4(); a != nil {
copy(mreq.Interface[:], a)
goto done
}
}
}
done:
if bytealg.Equal(mreq.Multiaddr[:], IPv4zero.To4()) {
return errNoSuchMulticastInterface
}
return nil
}
func setReadBuffer(fd *netFD, bytes int) error {
err := fd.pfd.SetsockoptInt(syscall.SOL_SOCKET, syscall.SO_RCVBUF, bytes)
runtime.KeepAlive(fd)
return wrapSyscallError("setsockopt", err)
}
func setWriteBuffer(fd *netFD, bytes int) error {
err := fd.pfd.SetsockoptInt(syscall.SOL_SOCKET, syscall.SO_SNDBUF, bytes)
runtime.KeepAlive(fd)
return wrapSyscallError("setsockopt", err)
}
func setKeepAlive(fd *netFD, keepalive bool) error {
err := fd.pfd.SetsockoptInt(syscall.SOL_SOCKET, syscall.SO_KEEPALIVE, boolint(keepalive))
runtime.KeepAlive(fd)
return wrapSyscallError("setsockopt", err)
}
func setLinger(fd *netFD, sec int) error {
var l syscall.Linger
if sec >= 0 {
l.Onoff = 1
l.Linger = int32(sec)
} else {
l.Onoff = 0
l.Linger = 0
}
err := fd.pfd.SetsockoptLinger(syscall.SOL_SOCKET, syscall.SO_LINGER, &l)
runtime.KeepAlive(fd)
return wrapSyscallError("setsockopt", err)
}
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